CassiusDelaney
one sec ill post a pic of the thingy :)
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CassiusDelaney
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here it is :)
rctnk99
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The dartboard or the discounts?
CassiusDelaney
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Dart board that ones next ;)
rctnk99
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Ok, a probability question. You have 4 darts and 3 possible values. It's a combination since the order of the darts doesn't matter.
CassiusDelaney
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so the values are 1,5,9 5,9,1 and 9,1,5?
rctnk99
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Ah, sorry, it's a permutation.
CassiusDelaney
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oh ok
rctnk99
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The formula for a permutation is n! over (n-r)!
rctnk99
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n is 4, r is 3
CassiusDelaney
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so 1
rctnk99
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Do you know factorial notation?
CassiusDelaney
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nope :/
rctnk99
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Factorial is multiplying a number, then multiplying by one less, and it continues down to 1.
So 4! is 4*3*2*1, and 1! is 1. 4*3*2*1 also happens to be your answer.
CassiusDelaney
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what does the * mean?
rctnk99
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Multiply
CassiusDelaney
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so 24?
rctnk99
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That's it.
CassiusDelaney
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thanks buddy
:)
rctnk99
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While it's open, might as well solve the other one too.
CassiusDelaney
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oh yeah thanks :)
rctnk99
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Imagine you start at 100 dollars. What's 10 percent off of that?
CassiusDelaney
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10...
rctnk99
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So 100-10 is 90. What is 20 percent of 90?
CassiusDelaney
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18?
rctnk99
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Yep. 90-18 is 72. So 100-72 is your total discount.
rctnk99
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Or 28%, to be exact.
CassiusDelaney
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oh ok thanks